Depending on the inclination angle between \(\hat{k}\)  and the orbital plane
of binary stars, gravitational wave in vector gravity can be linearly or
elliptically polarized in the same way as electromagnetic wave generated by
an oscillating quadrupole. Recall that in vector gravity \(\mathbf {h}\)  is
analogous to the vector potential \(\mathbf {A}\)  in electrodynamics [1]}.
